It is an alternative to variable speed systems, which necessitate a modified generator and power conditioning equipment.
For the selected sites in Egypt, it is found that it is possible for variable-speed systems to produce about 9% increase in the average probable power in comparison with fixed-speed systems.
Joseph R. Mastrangelo, a vice president with G.E.'s oil and gas division, said the acquisition would allow the company and its industrial and offshore oil and gas customers, for example, to readily replace inefficient fixed-speed drive technology with Converteam's more flexible variable-speed systems, saving energy.
In order to improve the effectiveness of variable speed wind systems, adaptive control systems able to cope with time variances of the system under control are necessary.
In the variable speed refrigeration system (VSRS), the capacity and superheat are respectively controlled by inverters and electronic expansion valves for saving energy and improving performance as well.
The off-design operation is achieved handling the following parameters: air mass flow rate, fuel mass flow rate, combustor bypass, gas turbine bypass, avoiding the use of a variable speed control system.
It has been obtained that the variable speed Stirling/generator system is capable to feed an uncontrollable load under variations of climatic conditions during hot, moderate and cold seasons, in remote areas in Tunisia.
In this article from the USA, Charles G. Stolberg, Executive Director of the Submersible Wastewater Pump Association, describes some of the contributing components of the variable speed pumping system and how they interact with certain other components, and provides information to properly evaluate the advantages and disadvantages of applying such a design to submersible pumping equipment.
"The average speed cameras will be removed from the M4 when work on the central reservation barriers and variable speed limit system is completed.
